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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement [Abstract]        
Operating Revenues $ 38,713 $ 36,174 $ 104,809 $ 99,319
Operating Expenses:        
Operations and Maintenance 18,114 16,383 52,773 49,178
Depreciation 3,792 3,587 11,137 10,280
Other Taxes 3,889 3,603 10,910 10,327
Total Operating Expenses 25,795 23,573 74,820 69,785
Operating Income 12,918 12,601 29,989 29,534
Other Income (Expense):        
Allowance for Funds Used During Construction 424 174 805 473
Other Income (Expense), net 409 248 1,277 684
Total Other Income, net 833 422 2,082 1,157
Interest Charges 1,723 1,493 4,929 3,965
Income before Income Taxes 12,028 11,530 27,142 26,726
Income Taxes (262) 3,888 1,683 9,263
Net Income 12,290 7,642 25,459 17,463
Preferred Stock Dividend Requirements 36 36 108 108
Earnings Applicable to Common Stock $ 12,254 $ 7,606 $ 25,351 $ 17,355
Earnings per share of Common Stock:        
Basic $ 0.75 $ 0.47 $ 1.55 $ 1.06
Diluted $ 0.74 $ 0.46 $ 1.54 $ 1.06
Average Number of Common Shares Outstanding:        
Basic 16,394 16,340 16,379 16,324
Diluted 16,550 16,496 16,535 16,480
Cash Dividends Paid per Common Share $ 0.2238 $ 0.2113 $ 0.6713 $ 0.6338